There's no dialogue in game from Jiub or the guard, and nothing to input my name. All that happens is the guard walks down and stares at me. I can't interact with any objects either. There also doesn't appear to be any in game sound other than the background music, since I can't hear the footsteps of the guard walking. My sound is enabled and turned up in game.

I installed OpenMW on another computer and it worked just fine on the other one. I compared the size of the fx folders on both and the one on my MacBook was way smaller. I copied the fx folder over and replaced the old one, and when I launched the game I could hear the footsteps of the guard and the creaking of the ship hull, but no voices. I figured out that the Vo folder probably stood for "Voices" so I decided to check the size of it, and it was way smaller again. Copied it over, replaced it, and now everything works. Voices play, subtitles show, lips move, and the name menu pops up.

I guess it might've been something with how I downloaded, or maybe when I transferred the files over because it seems really strange that those files were just missing. But it's all fixed now, so it's all good.